Osg 20556254 Corner Radius End Mill 5/8 in 5 Flute Carbide

Product Description

The OSG 20556254 is a solid carbide corner radius end mill engineered for demanding metal removal in stainless steel, superalloys, titanium, and hard materials. Built on OSG's Series 2055 platform, it features a 5/8 inch diameter, a 0.1200 inch corner radius, and five flutes with a variable helix and variable index geometry. The EXO PVD coating provides thermal and wear resistance suited to the high-heat environments generated when cutting difficult alloys. This tool handles both roughing and finishing operations in a single setup, making it a practical choice for machinists and toolroom professionals running CNC mills or machining centers.

This end mill is designed for use in CNC milling applications involving stainless steel, superalloys such as Inconel and similar nickel-based materials, titanium, and hardened steels. Its 1-1/4 inch length of cut and 3-1/2 inch overall length suit it for medium-depth pocketing, profiling, and contouring operations where corner integrity and surface finish are critical. The center-cutting geometry allows direct plunge entry, and the Weldon flat shank provides positive drive in compatible toolholders.

Key Features

• 5/8 inch diameter with matching 5/8 inch Weldon flat shank for secure toolholder engagement
• 0.1200 inch corner radius reduces stress concentrations and improves edge life at corner transitions
• Five-flute variable helix and variable index design dampens chatter and improves chip evacuation
• EXO PVD coating rated for stainless steel, superalloys, titanium, and hard materials
• Center-cutting geometry allows direct plunge milling without pre-drilling
• Ultra fine micrograin carbide substrate supports higher hardness and edge retention

Compatibility

Designed for use with standard toolholders accepting a 5/8 inch Weldon flat shank. Primary workpiece materials include stainless steel, superalloys, titanium, and hard materials per OSG material codes M, S, and H.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the spindle fully stopped and the machine in a safe, locked-out state. Secure the Weldon flat shank in a compatible toolholder and verify runout before cutting. Follow the machine tool manufacturer's recommended torque procedure for set screws. Confirm cutting parameters — speed, feed, and depth of cut — against OSG Series 2055 application guidelines for the specific workpiece material before production use.